Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence of the displayscreen or portion thereof with transitional graphical user interface(“UI”), wherein heavy dash-dash lines comprise a portion of the design;

FIG. 2 is a front view of a second image in the sequence; and,

FIG. 3 is a front view of a third image in the sequence.

The subject matter in this patent includes a process or period duringwhich an image sequentially transitions between the images shown inFIGS. 1-3. This process or period forms no part of the claimed design.

The stippling shown in FIG. 3 comprises a decorative feature that ispart of the claimed design and is meant to portray the illusion of acontrasting surface.

The broken lines rendered in thin lines including the showing of aportion of the display screen of a communications terminal surroundingthe illustrated design, the illustrated chart, all text and portions ofthe graphical user interface are included for the purpose ofillustrating the environment and form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.